Re: [slang-users] autoload loads two times

["John E. Davis" <davis@xxxxxxxxxxxxx>]

Jörg Sommer <joerg@xxxxxxxxxxxx> wrote:
>==> /tmp/bug.sl <==
>implements("bug");
>autoload("enable_stack_check", "stkcheck");

Since "bug" is the active namespace, stkcheck will be loaded into the
"bug" namespace.

>try
>{
>    enable_stack_check();
>}
>catch OpenError: {}

The above will cause stkcheck to load.

>() = evalfile("/tmp/bug2.sl");

This will cause bug2.sl to load.  Since no namespace argument was
specified, an anonymous one will be used with public symbols going
into the global namespace.

>==> /tmp/bug2.sl <==
>autoload("enable_stack_check", "stkcheck");

Since an anonymous namespace is active in this context, stkcheck will
get loaded into its own anonymous namespace when enable_stack_check is
called.

>try
>{
>    enable_stack_check();
>}
>catch OpenError: {}

The above will trigger stkcheck.sl to get loaded.

>==> /tmp/bug3.sl <==
>implements("bug");
>autoload("Global->enable_stack_check", "stkcheck");

This will cause stkcheck.sl to get loaded using the global namespace
for public objects.

>try
>{
>    enable_stack_check();
>}
>catch OpenError: {}

This will cause stkcheck.sl to load with enable_stack_check placed
into the global namespace.

>() = evalfile("/tmp/bug2.sl");

Since enable_stack_check is defined in the global namespace when
bug2.sl is loaded, its autoload statement placing it there will have
no effect.

>% xjed -batch -l /tmp/bug.sl | tail -n5
>loading /usr/share/jed/lib/compress.slc
>loading /tmp/bug.sl
>loading /usr/share/slsh/stkcheck.sl
>loading /tmp/bug2.sl
>loading /usr/share/slsh/stkcheck.sl

The above is exactly what I expected to see.

>% xjed -batch -l /tmp/bug3.sl | tail -n5
>loading /usr/share/jed/lib/modeinfo.slc
>loading /usr/share/jed/lib/compress.slc
>loading /tmp/bug3.sl
>loading /usr/share/slsh/stkcheck.sl
>loading /tmp/bug2.sl

The single load of stkcheck.sl is also correct.

>If I put the autoload() before the implements in bug.sl stkcheck.sl is
>not loaded twice. If I use evalfile() in bug.sl instead of autoload(),
>stkcheck.sl is also loaded only one time. I think this is a bug. autoload
>should behave like evalfile() in this case.

Please re-read the docs for autoload and evalfile.  If something is
not clear in the documentation, let me know and I will attempt to
improve it.

Thanks,
--John

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